Oftentimes when you're out for a drive, a lot of things end up hitting the windshield. Rocks can hit the windshield and may cause a chip after getting thrown up from the ground by a passing car or truck. However, another popular thing that hits the windshield is bugs. Invariably, bugs wind up flying into the path of a car that they wind of getting splattered against the windshield, making a really big mess on the windshield. This is a Comedy trope for when that splatting is Played for Laughs.